CN108962172B - Display voltage setting method and liquid crystal display device - Google Patents
Display voltage setting method and liquid crystal display device Download PDFInfo
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- CN108962172B CN108962172B CN201810863585.8A CN201810863585A CN108962172B CN 108962172 B CN108962172 B CN 108962172B CN 201810863585 A CN201810863585 A CN 201810863585A CN 108962172 B CN108962172 B CN 108962172B
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
- G09G3/3607—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals for displaying colours or for displaying grey scales with a specific pixel layout, e.g. using sub-pixels
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/006—Electronic inspection or testing of displays and display drivers, e.g. of LED or LCD displays
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Abstract
The invention provides a method for setting display voltage of a liquid crystal display panel and a liquid crystal display device, belongs to the technical field of display, and can at least partially solve the problem that the conventional display voltage cannot give consideration to two working environments of high temperature and normal temperature. The setting method of the present invention includes setting a common voltage to a first common voltage; setting the positive frame voltage of the test gray scale of the sub-pixel as a corresponding first positive frame voltage, and setting the negative frame voltage of the test gray scale of the sub-pixel as a corresponding first negative frame voltage, wherein the test gray scale is used for testing a flicker value; at least part of the gray scales are non-test gray scales except the test gray scale, and the setting step further comprises: and setting the positive frame voltage and the negative frame voltage of the non-test gray scale according to the common voltage deviation value and the first positive frame voltage and the first negative frame voltage corresponding to the non-test gray scale.
Description
Technical Field
The invention belongs to the technical field of display, and particularly relates to a method for setting display voltage of a liquid crystal display panel and a liquid crystal display device.
Background
The conventional method for setting the display voltage of the liquid crystal display panel generally comprises the following steps: finding out the public voltage with the minimum flicker value by testing the flicker value (flicker) of the special test picture, and setting the public voltage as the public voltage for driving the liquid crystal display panel; the brightness of the pure color film (such as red, green and blue) under each gray scale is adjusted, so that the change rule of the brightness of different gray scales of each pure color along with the gray scale is in accordance with a set gamma curve, and the positive frame voltage and the negative frame voltage of different gray scales of each pure color film are determined. When the common voltage, the positive frame voltage and the negative frame voltage of each gray scale are well adjusted, the corresponding driving code is written into a memory in a driving chip. Therefore, the driving chip drives the liquid crystal display panel according to the common voltage of the group of driving codes, the positive frame voltage and the negative frame voltage of each gray scale.
The existing method comprises the following steps: if the customer pays attention to the flicker value of the picture at normal temperature, debugging the sample at normal temperature, and determining a group of driving codes with the flicker value meeting the specification at normal temperature to be burnt into the driving chip; if the customer pays attention to the flicker value of the picture at high temperature, the sample is debugged at high temperature, and a group of driving codes with flicker values meeting the specification at high temperature is determined to be burnt into the driving chip. Because the liquid crystal molecules are different at normal temperature and high temperature, the flicker value of a group of driving codes with the flicker value meeting the specification at normal temperature is increased at high temperature (the flicker of the picture is intensified); and a group of drive codes with the flicker values meeting the specification at high temperature have large flicker values at normal temperature, namely, a group of drive codes in the prior art cannot give consideration to two application environments of normal temperature and high temperature.
Disclosure of Invention
The invention at least partially solves the problem that the flicker value parameter of the existing setting method of the display voltage of the liquid crystal display panel can not take into account both normal temperature and high temperature, and provides a setting method of the display voltage of the liquid crystal display panel and a liquid crystal display device.
According to a first aspect of the present invention, there is provided a setting method of a display voltage of a liquid crystal display panel including a plurality of sub-pixels, the setting method comprising:
setting: setting the common voltage to a first common voltage; setting the positive frame voltage of the test gray scale of the sub-pixel as a corresponding first positive frame voltage, and setting the negative frame voltage of the test gray scale of the sub-pixel as a corresponding first negative frame voltage, wherein the test gray scale is used for testing a flicker value;
at least part of the gray scales are non-test gray scales except the test gray scale, and the setting step further comprises: setting positive frame voltage and negative frame voltage of the non-test gray scale according to the common voltage deviation value and the first positive frame voltage and the first negative frame voltage corresponding to the non-test gray scale;
the testing device comprises a first public voltage, a first positive frame voltage of a testing gray scale and a first negative frame voltage of the testing gray scale, wherein the first public voltage, the first positive frame voltage of the testing gray scale and the first negative frame voltage of the testing gray scale correspond to the testing gray scale at normal temperature, flicker values of the testing gray scale meet the standard, the public voltage deviation value is determined according to the difference between the first public voltage and a second public voltage, the second public voltage is the public voltage according to the flicker values of the first positive frame voltage and the first negative frame voltage of the testing gray scale at high temperature, and the first positive frame voltage and the first negative frame voltage corresponding to the non-testing gray scale are the positive frame voltage and the negative frame voltage of the non-testing gray scale, of which gamma curves meet the standard, when the public voltage is set as the first public voltage at normal temperature.
Optionally, before the setting step, the method further comprises:
enabling the liquid crystal display panel to display a flicker value test picture of a test gray scale at normal temperature, testing the flicker value of the test gray scale, and determining a first common voltage of the sub-pixel at the normal temperature, a first positive frame voltage and a first negative frame voltage of the test gray scale;
enabling the liquid crystal display panel to display a flicker value test picture of the test gray scale at high temperature and testing the flicker value of the test gray scale, wherein a positive frame voltage and a negative frame voltage corresponding to the test gray scale are kept unchanged as a corresponding first positive frame voltage and a corresponding first negative frame voltage, and changing a common voltage value to obtain a second common voltage of which the high-temperature flicker value of the test gray scale meets the specification;
determining the common voltage offset value according to a difference between the first common voltage and a corresponding second common voltage.
Optionally, the test gray scale is multiple, each test gray scale has the same first common voltage, and the common voltage offset value is equal to an average value of differences between the first common voltage and each corresponding second common voltage.
Optionally, the number of the test gray scales is one, and the common voltage offset value is equal to a difference between the first common voltage and the corresponding second common voltage.
Optionally, the normal temperature range is 15-30 ℃.
Optionally, the high temperature range is 40-90 ℃.
Optionally, the setting of the positive frame voltage and the negative frame voltage of the non-test gray scale according to the common voltage offset value and the first positive frame voltage and the first negative frame voltage corresponding to the non-test gray scale includes:
and setting the positive frame voltage of the non-test gray scale as the sum of the corresponding first positive frame voltage and the common voltage offset value, and setting the negative frame voltage of the non-test gray scale as the sum of the corresponding first negative frame voltage and the common voltage offset value.
According to a second aspect of the present invention, there is provided a liquid crystal display device comprising a liquid crystal display panel and a driving module driving the liquid crystal display panel, the liquid crystal display panel comprising a plurality of sub-pixels, the driving module comprising a memory for storing driving codes for setting a positive frame voltage of each gray scale of the sub-pixels, a negative frame voltage of each gray scale of the sub-pixels, and a common voltage,
the common voltage is set to a first common voltage;
the positive frame voltage of the test gray scale of the sub-pixel is set as a corresponding first positive frame voltage, the negative frame voltage of the test gray scale of the sub-pixel is set as a corresponding first negative frame voltage, and the test gray scale is used for testing a flicker value;
at least part of gray scales are non-test gray scales except the test gray scale, and the positive frame voltage and the negative frame voltage of the non-test gray scales are set according to the public voltage deviation value and the first positive frame voltage and the first negative frame voltage corresponding to the non-test gray scales;
the testing device comprises a first public voltage, a first positive frame voltage of a testing gray scale and a first negative frame voltage of the testing gray scale, wherein the first public voltage, the first positive frame voltage of the testing gray scale and the first negative frame voltage of the testing gray scale correspond to the testing gray scale at normal temperature, flicker values of the testing gray scale meet the standard, the public voltage deviation value is determined according to the difference between a second public voltage and the first public voltage, the second public voltage is the public voltage according to the flicker values of the first positive frame voltage and the first negative frame voltage of the testing gray scale at high temperature, and the first positive frame voltage and the first negative frame voltage corresponding to the non-testing gray scale are the positive frame voltage and the negative frame voltage of the non-testing gray scale, of which gamma curves meet the standard, when the public voltage is set as the first public voltage at normal temperature.
Optionally, the positive frame voltage of the non-test gray scale is set to a sum of a corresponding first positive frame voltage and the common voltage offset value, where the first positive frame voltage of the non-test gray scale is a positive frame voltage of the non-test gray scale that makes a gamma curve meet a specification when the common voltage is set to the first common voltage at the normal temperature, and the negative frame voltage of the non-test gray scale is set to a sum of a corresponding first negative frame voltage and the common voltage offset value, where the first negative frame voltage of the non-test gray scale is a negative frame voltage of the non-test gray scale that makes the gamma curve meet the specification when the common voltage is set to the first common voltage at the normal temperature.
Optionally, the normal temperature range is 15-30 ℃, and the high temperature range is 40-90 ℃.
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Fig. 1 is a flowchart of a method for setting a display voltage of a liquid crystal display panel according to an embodiment of the invention.
Detailed Description
In order to make the technical solutions of the present invention better understood, the present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
The test gray scale in the invention is the gray scale of the pixel to be displayed in the flicker value test picture for measuring the flicker value. For example, a flicker value test picture with a test gray level of L127 means that the positive frame voltage and the negative frame voltage of the pixel to be displayed in the flicker value test picture are set according to the positive frame voltage and the negative frame voltage specified by the corresponding gray level of L127. Generally, a flicker value test picture with L127 gray levels is usually selected in engineering (for the case of 256 gray levels), but the number of test gray levels may be multiple and which gray level is selected specifically. For example, two flicker value test pictures are selected, wherein the gray scale of each pixel to be displayed in one flicker value test picture is respectively selected as L127, and the gray scale of each pixel to be displayed in the other flicker value test picture is respectively selected as L126. The positive frame voltage of the test gray scale is also the set value of the positive frame voltage of different sub-pixels corresponding to the test gray scale in the drive chip, and the negative frame voltage of the test gray scale is also the set value of the negative frame voltage of different sub-pixels corresponding to the test gray scale in the drive chip. The first common voltage, the first positive frame voltage and the first negative frame voltage in the invention are a group of display voltages which are determined by testing the liquid crystal display panel at normal temperature and meet the flicker value specification and other technical indexes (such as gamma curve, color temperature and the like) at normal temperature. The second common voltage is the common voltage which is found by adjusting the common voltage and enables the flicker value of the display picture to meet the standard when the test gray scale is set according to the first positive frame voltage and the first negative frame voltage. The flicker value is in accordance with the specification, that is, the flicker value is smaller than the set threshold, and in actual operation, when the optimal common voltage is found, the common voltage which enables the flicker value to be the lowest is generally found when the flicker value is smaller than the set threshold.
Example 1:
the present embodiment provides a method for setting a display voltage of a liquid crystal display panel, where the liquid crystal display panel includes a plurality of sub-pixels, as shown in fig. 1, the method includes:
setting: setting the common voltage to a first common voltage; setting the positive frame voltage of the test gray scale of the sub-pixel as a corresponding first positive frame voltage, and setting the negative frame voltage of the test gray scale of the sub-pixel as a corresponding first negative frame voltage, wherein the test gray scale is used for testing a flicker value;
at least part of the gray scales are non-test gray scales except the test gray scale, and the setting step further comprises: setting positive frame voltage and negative frame voltage of the non-test gray scale according to the common voltage deviation value and the first positive frame voltage and the first negative frame voltage corresponding to the non-test gray scale;
the first common voltage, the first positive frame voltage of the test gray scale and the first negative frame voltage of the test gray scale are common voltage, positive frame voltage and negative frame voltage which correspond to the test gray scale at normal temperature and have flicker values meeting the specification, the common voltage deviation value is determined according to the difference between the first common voltage and the second common voltage, the second common voltage is common voltage of which the flicker values meet the specification at high temperature according to the first positive frame voltage and the first negative frame voltage of the test gray scale, and the first positive frame voltage and the first negative frame voltage corresponding to the non-test gray scale are positive frame voltage and negative frame voltage of which gamma curves meet the specification when the common voltage is set as the first common voltage at normal temperature.
Taking the test gray scale as the L127 gray scale as an example, the inversion mode of the corresponding display panel is, for example, row inversion, and the display panel has subpixels with three colors of red, green and blue, the flicker value test picture corresponding to the test gray scale is that the first row of pixels displays red of the L127 gray scale, the second row of pixels displays green of the L127 gray scale, and the third row of pixels displays blue of the L127 gray scale, and the cycle is taken as the period for displaying.
The first common voltage is determined to be 0V at normal temperature, the first positive frames of the red, green and blue colors corresponding to the L127 gray scale determined at the normal temperature are 2.4V, 2.4V and 2.4V in sequence, and the first negative frames of the red, green and blue colors corresponding to the L127 gray scale determined at the normal temperature are-2.4V, -2.4V and-2.4V in sequence. With the arrangement, the flicker value of the display picture of the liquid crystal display panel at normal temperature is in accordance with the standard, and if the flicker value of the display picture of the flicker value test picture of the L127 gray scale is in accordance with the standard after the common voltage is adjusted to-0.07V under high temperature, the positive frame voltage of the display voltages of the red, green and blue sub-pixels of the L127 gray scale of the liquid crystal display panel is sequentially set to be 2.4V, 2.4V and 2.4V, the negative frame voltage thereof is sequentially set to be-2.4V, -2.4V and-2.4V, and the common voltage is still 0V.
The method further needs to obtain a first positive frame voltage and a first negative frame voltage corresponding to the non-test gray scale meeting the specification according to the existing parameter test such as gamma curve, color temperature and the like at normal temperature, and at the moment, the common voltage is still set to be the first common voltage.
And setting a positive frame voltage and a negative frame voltage of the non-test gray scale according to the common voltage offset value, the first positive frame voltage and the first negative frame voltage corresponding to the non-test gray scale, namely correcting the first positive frame voltage and the first negative frame voltage of the non-test gray scale by using the common voltage offset value to obtain the corrected positive frame voltage and negative frame voltage of the non-test gray scale, and setting a product (specifically, setting a register in a driving chip for driving the display panel) in a final product according to the corrected values.
The correction method is, for example: and setting the positive frame voltage of the non-test gray scale as the sum of the corresponding first positive frame voltage and the common voltage offset value, and setting the negative frame voltage of the non-test gray scale as the sum of the corresponding first negative frame voltage and the common voltage offset value.
Of course, those skilled in the art may set the positive frame voltage of the non-test gray scale to the sum of the set ratios of the corresponding first positive frame voltage and the common voltage offset value, and set the negative frame voltage of the non-test gray scale to the sum of the set ratios of the corresponding first negative frame voltage and the common voltage offset value.
By the correction method, when the liquid crystal molecules in each sub-pixel of the liquid crystal display panel rotate according to the positive frame voltage and the negative frame voltage specified by the non-test gray scale, deflection increment towards a certain direction is generated, and the deflection increment can just offset the influence on the liquid crystal molecules due to temperature rise, so that the detected flicker value can still meet the specification when the liquid crystal display panel displays a flicker value test picture. The adjustment amount of the positive frame voltage and the negative frame voltage with respect to the first positive frame voltage and the first negative frame voltage is very small for each of the non-test gray levels, which has a negligible effect on other display indexes such as a gamma curve. Therefore, the driving chip of the liquid crystal display panel is set according to the method, and finally the yield of the liquid crystal display panel is also greatly improved.
Because the difference between the display panels of the same batch is relatively small, several or 1 display panel of the same batch can be tested, and then the display voltages of all the display panels of the batch are set identically according to the parameters.
For example, the flicker test picture is a column inversion picture with L127 gray scale, and the first common voltage is determined to be 0V, the second common voltage is determined to be-0.07V, and the common voltage offset value is determined to be 0.07V by the above test method. For the non-test gray scale of L255 for the red sub-pixel, the first positive frame voltage is set to 5V and the first negative frame voltage is set to-5V according to the common voltage set to 0V at normal temperature, so that the common voltage is set to 0V in the driving code of the final product, the positive frame voltage of the L255 gray-scale red sub-pixel is set to 5.07V (5V +0.07V), and the negative frame voltage of the L255 gray-scale red sub-pixel is set to-4.93V (-5V + 0.07V). The other non-test gray levels are set by the same method as above for the positive frame voltage and the negative frame voltage.
As shown in fig. 1, before the setting step, the common voltage offset value needs to be determined, and the specific method is as follows:
firstly, enabling the liquid crystal display panel to display a flicker value test picture of a test gray scale at normal temperature, testing the flicker value of the test gray scale, and determining a first common voltage of a sub-pixel at the normal temperature, a first positive frame voltage and a first negative frame voltage of the test gray scale.
That is, at normal temperature, the liquid crystal display panel displays a flicker value test picture of a test gray scale, and uses a combination of different common voltages, positive frame voltages and negative frame voltages, wherein the common voltage meeting flicker value specifications is a first common voltage, the positive frame voltage at this time is a first positive frame voltage, and the negative frame voltage at this time is a first negative frame voltage.
And then, enabling the liquid crystal display panel to display a flicker value test picture of the test gray scale at high temperature, and testing the flicker value of the test gray scale, wherein the positive frame voltage and the negative frame voltage corresponding to the test gray scale are kept unchanged as the corresponding first positive frame voltage and the corresponding first negative frame voltage, and the common voltage value is changed to obtain a second common voltage with the high-temperature flicker value of the test gray scale meeting the specification.
Namely, the first positive frame voltage and the first negative frame voltage determined by a normal temperature test are adopted, and the public voltage which enables the flicker value to meet the specification is adjusted and found at a high temperature to be used as the second public voltage.
Finally, a common voltage offset value is determined according to the difference between the first common voltage and the corresponding second common voltage.
Optionally, the test gray scale is multiple, each test gray scale has the same first common voltage, and the common voltage offset value is equal to an average value of differences between the first common voltage and each corresponding second common voltage. That is, the average trend of the common voltage shift is found through a plurality of test gray levels. Of course, the common voltage offset value may be calculated by other methods such as a weighted average of the above differences.
Optionally, the test gray scale is one, and the common voltage offset value is equal to a difference between the first common voltage and the corresponding second common voltage.
When a 5.46-inch FHD liquid crystal display panel is tested, after the liquid crystal display panel is driven by the display voltage determined by the method, the normal-temperature flicker value is tested to be 5%, and the high-temperature flicker value is tested to be 8.6%, which are both within an acceptable range. Engineering flicker values are generally required to be no more than 12.6%.
Optionally, the normal temperature range is 15-30 ℃.
Optionally, the high temperature range is 40-90 ℃.
Example 2:
the embodiment provides a liquid crystal display device, comprising a liquid crystal display panel and a driving module for driving the liquid crystal display panel, wherein the liquid crystal display panel comprises a plurality of sub-pixels, the driving module comprises a memory for storing driving codes, the driving codes are used for setting positive frame voltages of all gray scales of the sub-pixels, negative frame voltages of all gray scales of the sub-pixels and a common voltage,
the common voltage is set to a first common voltage;
setting the positive frame voltage of the testing gray scale of the sub-pixel as a corresponding first positive frame voltage, setting the negative frame voltage of the testing gray scale of the sub-pixel as a corresponding first negative frame voltage, wherein the testing gray scale is used for testing a flicker value;
at least part of the gray scales are non-test gray scales except the test gray scales, and the positive frame voltage and the negative frame voltage of the non-test gray scales are set according to the public voltage deviation value and the first positive frame voltage and the first negative frame voltage corresponding to the non-test gray scales;
the first common voltage, the first positive frame voltage of the test gray scale and the first negative frame voltage of the test gray scale are common voltage, positive frame voltage and negative frame voltage which correspond to the test gray scale at normal temperature and have flicker values meeting the specification, the common voltage deviation value is determined according to the difference between the second common voltage and the first common voltage, the second common voltage is common voltage of which the flicker values meet the specification at high temperature according to the first positive frame voltage and the first negative frame voltage of the test gray scale, and the first positive frame voltage and the first negative frame voltage corresponding to the non-test gray scale are positive frame voltage and negative frame voltage of which gamma curves meet the specification when the common voltage is set as the first common voltage at normal temperature.
Optionally, the positive frame voltage of the non-test gray scale is set to a sum of a corresponding first positive frame voltage and a common voltage offset value, where the first positive frame voltage of the non-test gray scale is a positive frame voltage of the non-test gray scale that makes the gamma curve meet the specification when the common voltage is set to the first common voltage at the normal temperature, and the negative frame voltage of the non-test gray scale is set to a sum of a corresponding first negative frame voltage and a common voltage offset value, where the first negative frame voltage of the non-test gray scale is a negative frame voltage of the non-test gray scale that makes the gamma curve meet the specification when the common voltage is set to the first common voltage at the normal temperature.
Optionally, the normal temperature range is 15-30 ℃, and the high temperature range is 40-90 ℃.
That is, the driving module (for example, a driving chip) in the liquid crystal display device is set according to the data voltage determined in embodiment 1. Therefore, the flicker value of the liquid tank display device is in accordance with the standard under both normal temperature and high temperature conditions.
Specifically, the liquid crystal display device can be any product or component with a display function, such as a Chip On Glass (COG) bonding piece, a circuit board on Glass (FOG) bonding piece, a liquid crystal display module, a mobile phone, a tablet computer, a television, a display, a notebook computer, a digital photo frame, a navigator and the like.
It will be understood that the above embodiments are merely exemplary embodiments taken to illustrate the principles of the present invention, which is not limited thereto. It will be apparent to those skilled in the art that various modifications and improvements can be made without departing from the spirit and substance of the invention, and these modifications and improvements are also considered to be within the scope of the invention.
Claims (10)
1. A method for setting a display voltage of a liquid crystal display panel, the liquid crystal display panel comprising a plurality of sub-pixels, the method comprising:
setting: setting the common voltage to a first common voltage; setting the positive frame voltage of the test gray scale of the sub-pixel as a corresponding first positive frame voltage, and setting the negative frame voltage of the test gray scale of the sub-pixel as a corresponding first negative frame voltage, wherein the test gray scale is used for testing a flicker value;
at least part of the gray scales are non-test gray scales except the test gray scale, and the setting step further comprises: setting positive frame voltage and negative frame voltage of the non-test gray scale according to the common voltage deviation value and the first positive frame voltage and the first negative frame voltage corresponding to the non-test gray scale;
the testing device comprises a first public voltage, a first positive frame voltage of a testing gray scale and a first negative frame voltage of the testing gray scale, wherein the first public voltage, the first positive frame voltage of the testing gray scale and the first negative frame voltage of the testing gray scale correspond to the testing gray scale at normal temperature, flicker values of the testing gray scale meet the standard, the public voltage deviation value is determined according to the difference between the first public voltage and a second public voltage, the second public voltage is the public voltage according to the flicker values of the first positive frame voltage and the first negative frame voltage of the testing gray scale at high temperature, and the first positive frame voltage and the first negative frame voltage corresponding to the non-testing gray scale are the positive frame voltage and the negative frame voltage of the non-testing gray scale, of which gamma curves meet the standard, when the public voltage is set as the first public voltage at normal temperature.
2. The setting method according to claim 1, further comprising, before the setting step:
enabling the liquid crystal display panel to display a flicker value test picture of a test gray scale at normal temperature, testing the flicker value of the test gray scale, and determining a first common voltage of the sub-pixel at the normal temperature, a first positive frame voltage and a first negative frame voltage of the test gray scale;
enabling the liquid crystal display panel to display a flicker value test picture of the test gray scale at high temperature and testing the flicker value of the test gray scale, wherein a positive frame voltage and a negative frame voltage corresponding to the test gray scale are kept unchanged as a corresponding first positive frame voltage and a corresponding first negative frame voltage, and changing a common voltage value to obtain a second common voltage of which the high-temperature flicker value of the test gray scale meets the specification;
determining the common voltage offset value according to a difference between the first common voltage and a corresponding second common voltage.
3. The setting method as claimed in claim 2, wherein the test gray scale is plural, each test gray scale has the same first common voltage, and the common voltage offset value is equal to an average value of differences between the first common voltage and each corresponding second common voltage.
4. The setting method as claimed in claim 2, wherein the test gray scale is one, and the common voltage offset value is equal to a difference between the first common voltage and the corresponding second common voltage.
5. The setting method according to claim 1, wherein the normal temperature is in a range of 15 to 30 ℃.
6. The setting method according to claim 1, wherein the high temperature is in a range of 40 to 90 ℃.
7. The setting method according to claim 1, wherein the setting of the positive frame voltage and the negative frame voltage of the non-test gray scale according to the common voltage offset value, the first positive frame voltage and the first negative frame voltage corresponding to the non-test gray scale comprises:
and setting the positive frame voltage of the non-test gray scale as the sum of the corresponding first positive frame voltage and the common voltage offset value, and setting the negative frame voltage of the non-test gray scale as the sum of the corresponding first negative frame voltage and the common voltage offset value.
8. A liquid crystal display device includes a liquid crystal display panel and a driving module driving the liquid crystal display panel, the liquid crystal display panel including a plurality of sub-pixels, the driving module including a memory for storing driving codes for setting a positive frame voltage of each gray scale of the sub-pixels, a negative frame voltage of each gray scale of the sub-pixels, and a common voltage,
the common voltage is set to a first common voltage;
the positive frame voltage of the test gray scale of the sub-pixel is set as a corresponding first positive frame voltage, the negative frame voltage of the test gray scale of the sub-pixel is set as a corresponding first negative frame voltage, and the test gray scale is used for testing a flicker value;
at least part of gray scales are non-test gray scales except the test gray scale, and the positive frame voltage and the negative frame voltage of the non-test gray scales are set according to the public voltage deviation value and the first positive frame voltage and the first negative frame voltage corresponding to the non-test gray scales;
the testing device comprises a first public voltage, a first positive frame voltage of a testing gray scale and a first negative frame voltage of the testing gray scale, wherein the first public voltage, the first positive frame voltage of the testing gray scale and the first negative frame voltage of the testing gray scale correspond to the testing gray scale at normal temperature, flicker values of the testing gray scale meet the standard, the public voltage deviation value is determined according to the difference between a second public voltage and the first public voltage, the second public voltage is the public voltage according to the flicker values of the first positive frame voltage and the first negative frame voltage of the testing gray scale at high temperature, and the first positive frame voltage and the first negative frame voltage corresponding to the non-testing gray scale are the positive frame voltage and the negative frame voltage of the non-testing gray scale, of which gamma curves meet the standard, when the public voltage is set as the first public voltage at normal temperature.
9. The display device according to claim 8,
the positive frame voltage of the non-test gray scale is set to be the sum of a corresponding first positive frame voltage and the public voltage offset value, wherein the first positive frame voltage of the non-test gray scale is the positive frame voltage of the non-test gray scale which enables a gamma curve to meet the specification when the public voltage is set to be the first public voltage at normal temperature, the negative frame voltage of the non-test gray scale is set to be the sum of a corresponding first negative frame voltage and the public voltage offset value, and the first negative frame voltage of the non-test gray scale is the negative frame voltage which enables the gamma curve to meet the specification when the public voltage is set to be the first public voltage at normal temperature.
10. The display device according to claim 8, wherein the normal temperature is in a range of 15 to 30 ℃ and the high temperature is in a range of 40 to 90 ℃.
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